摘要 准噶尔盆地玛南地区乌尔禾组砂砾岩储层具较大规模勘探潜力。通过岩心观察、描述与测量,结合粒径及砾石成分微观分析,对玛南乌尔禾组砂砾岩储层进行岩石学特征、沉积序列与模式、沉积微相及展布特征的细化研究。研究表明,乌尔禾组砂砾岩分3种类型:含泥含砂砾岩、泥质砾岩、砂质细砾岩。砾石成分复杂,以基性至中酸性岩浆岩砾石为主,具体分3种:火山熔岩砾石、凝灰岩砾石与长英质砾石。玛南乌尔禾组沉积背景为扇三角洲体系,在扇三角洲斜坡广泛发育事件性高密度重力流沉积,主要沉积微相分为6种,包括4种重力流沉积,泥石流沉积、颗粒流沉积、浊流沉积和洪泛沉积;1种牵引流沉积相,水下河道沉积;还包含滨浅湖沉积微相。不同微相具不同储集能力,特别是渗透率差异显著、多期叠置的颗粒流沉积夹水下河道砂岩层段,为乌尔禾组优质储层主要层段。 The glutenite reservoir of Wuerhe formation in Manan area of Junggar basin has great exploration potential.Through core observation,description and measurement,combined with micro analysis of grain size and gravel composition,the petrological characteristics,sedimentary sequence and model,sedimentary microfacies and distribution characteristics of glutenite reservoir in Manan Wuerhe formation are studied.The research shows that the glutenite of Wuerhe formation can be divided into three types:argillaceous bearing glutenite,argillaceous conglomerate and sandy fine conglomerate;the composition of gravel is complex,mainly composed of basic to intermediate acid magmatic rock gravel,which can be divided into three types:volcanic lava gravel,tuff gravel and felsic gravel.The sedimentary background of Wuerhe formation of Mahu depression south is the fan delta system.The Event high-density gravity flow deposition is widely developed in the fan delta slope.The main sedimentary microfacies can be divided into 6 types:4 types of gravity flow deposition,debris flow deposition,particle flow deposition,turbidity current deposition and flood deposition.A traction flow sedimentary facies,underwater channel deposition;It also contains shore-shallow lacustrine sedimentary microfacies.Different microfacies have different reservoir capacity,especially the permeability difference is significant.The multi-phase superposition grain flow sedimentary subaqueous channel sandstone layer is the main layer of highquality reservoir of Wuerhe formation.
出处 《新疆地质》 CAS CSCD 北大核心 2021年第1期104-111,共8页 Xinjiang Geology
基金 国家科技重大专项(2017ZX05008-004-008) 中国石油科技重大专项(2017E-0401)联合资助。
关键词 砂砾岩类型 砾石成分 沉积模式 乌尔禾组 玛南地区 Glutenite type Gravel composition Sedimentary model Wuerhe formation Manan area
